52/4 + 8z^2
I need help solving this equation?

Plz heeeeeeelp plz give me the answer

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers